<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>

    </style>
</head>

<body>
    <div id="app">
        <ul>
            <li v-for="item in num">{{item.number}}
                <button @click="del(item.id)">删除</button>

            </li>
        </ul>
        <button @click="add">生成</button>
    </div>
    <script src="../vue.js"></script>
    <!--  -->
    <script>
        const app = new Vue({
            el: '#app',
            data: {
                num: [{
                    id: 1,
                    number: 1
                }, {
                    id: 2,
                    number: 2
                }, {
                    id: 3,
                    number: 3
                }, {
                    id: 4,
                    number: 4
                }]
            },
            methods: {
                del(id) {
                    this.num = this.num.filter(item => item.id !== id)
                },
                add() {
                    const obj = {
                        id: this.num.length + 1,
                        number: Math.floor(Math.random() * 20)
                    }
                    this.num.push(obj)
                }
            }
        })
    </script>

</body>

</html>